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Related Experiment Video

Updated: Jun 8, 2026

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
10:51

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Published on: January 15, 2018

Locations of serial reach targets are coded in multiple reference frames.

Aidan A Thompson1, Denise Y P Henriques

  • 1Centre for Vision Research, York University, 4700 Keele Street, Toronto, ON, Canada.

Vision Research
|September 21, 2010
PubMed
Summary
This summary is machine-generated.

Sequential target locations are coded using a combination of eye-fixed and relative frames, influencing reaching errors based on gaze direction and target spacing.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Factors

Background:

  • Previous research indicates remembered target locations are stored in an eye-fixed reference frame.
  • Gaze-dependent errors in reaching movements suggest representations are not fixed to the head, body, or world.

Purpose of the Study:

  • To investigate whether sequentially presented targets are coded relative to gaze (egocentrically) or relative to each other (allocentrically).
  • To determine if intervening eye movements alter the coding of sequential target locations.

Main Methods:

  • Participants performed reaching movements to two briefly presented targets.
  • An intervening saccade was introduced between reaches to assess the effect of gaze shifts.
  • Reaching errors and distances between sequential reach endpoints were analyzed in relation to gaze direction.

Main Results:

  • Reaching errors systematically varied with the distance between current gaze and target, supporting an eye-fixed frame.
  • The change in distance between sequential reach endpoints was smaller than predicted by a pure eye-fixed model.
  • This suggests that allocentric coding (relative target positions) also contributes to sequential reach planning.

Conclusions:

  • Spatial coding and updating of sequential reach targets utilize a weighted combination of multiple reference frames.
  • An eye-fixed frame is a primary component, but allocentric information is also integrated.
  • This provides insight into the complex neural mechanisms underlying visuomotor control and spatial memory.